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R290 is a type of refrigerant that is also known as propane. It is a hydrocarbon refrigerant that has low global warming potential (GWP) and ozone depletion potential (ODP). R290 is commonly used in refrigeration and air conditioning systems, as well as for domestic and commercial refrigeration applications. It is a highly efficient refrigerant that provides excellent cooling performance with low energy consumption. However, due to its flammability, it requires special handling and safety precautions during installation and maintenance.

R290, also known as propane, is a refrigerant gas with the following technical parameters:

- Chemical formula: C3H8
- Molecular weight: 44.10 g/mol
- Boiling point at atmospheric pressure: -42.1°C (-43.8°F)
- Critical temperature: 96.7°C (206.1°F)
- Critical pressure: 42.5 bar (616.9 psi)
- Ozone depletion potential (ODP): 0
- Global warming potential (GWP): 3 (over a 100-year time horizon)

R290 is classified as an A3 refrigerant, meaning it is highly flammable and requires specific safety and handling procedures. It is primarily used in smaller refrigeration and air conditioning applications, as well as in transportation refrigeration.